cast.go

     1  // Copyright 2024 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package hkdf
     6  
     7  import (
     8  	"bytes"
     9  	"crypto/internal/fips140"
    10  	_ "crypto/internal/fips140/check"
    11  	"crypto/internal/fips140/sha256"
    12  	"errors"
    13  )
    14  
    15  func init() {
    16  	fips140.CAST("HKDF-SHA2-256", func() error {
    17  		input := []byte{
    18  			0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
    19  			0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
    20  		}
    21  		want := []byte{
    22  			0xb6, 0x53, 0x00, 0x5b, 0x51, 0x6d, 0x2b, 0xc9,
    23  			0x4a, 0xe4, 0xf9, 0x51, 0x73, 0x1f, 0x71, 0x21,
    24  			0xa6, 0xc1, 0xde, 0x42, 0x4f, 0x2c, 0x99, 0x60,
    25  			0x64, 0xdb, 0x66, 0x3e, 0xec, 0xa6, 0x37, 0xff,
    26  		}
    27  		got := Key(sha256.New, input, input, string(input), len(want))
    28  		if !bytes.Equal(got, want) {
    29  			return errors.New("unexpected result")
    30  		}
    31  		return nil
    32  	})
    33  }
    34
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